Form 9.B Project Summary



Proposal Number:


Project Title:

Control and Alteration of Wing-Tip

Flowfield for Induced Drag Reduction

Technical Abstract (Limit 200 words)

The ability to alter positively the wing-tip flowfield

is a dominant factor for reducing drag-due-to-lift

and improving the aerodynamic efficiency of civil

transports. The induced drag problem exists due to

the finite span of the wing and consequently, the

formation of a tip vortex. A novel technique for

reducing induced drag is proposed. This research

focuses on effective control of the wing-tip vortex

through modifications of the tip geometry, thereby

altering the vortex initiation flowfield and

reducing the intensity of the shear-layer roll-up

process. The technique is innovative because of its

simplicity. The effort focuses on the control of

vortex-induced drag for moderate to high aspect

ratio wings and simulation of the modified tip-vortex

flowfield. The reduction in fuel burn associated with

enhanced aerodynamic performance will help

NASA meet its goal of environmental compatibility


Potential Commercial Applications (Limit 200 words)

Design of fuel efficient wings for commercial and

military aircraft, better design of rotor blades to

improve rotorcraft performance, accurate

simulation of trailing-line vortices for developing

wake hazard reduction strategies.

Name and Address of Principal Investigator (Name,

Organization Name, Mail Address, City/State/Zip)

Mehdi R. Khorrami

High Technology Corporation

28 Research Drive

Hampton , VA 23666

Name and Address of Offeror (Firm Name, Mail Address,


Mujeeb R. Malik

High Technology Corporation

28 Research Drive

Hampton , VA 23666